Anatomy Of The Ear

Question 1

Three major divisions of the temporal bone

Answer 1

Pinna,

Question 2

Internal vs external ear?

Answer 2

Tympanic membrane and out is external ear

Question 3

What are the parts of the external ear?

When does the ear form embryologically?

Answer 3

Helix, anti helix, concha, Travis, antitragus

Can understand the abnormal ear

28 weeks

Question 4

External carotid A

Anteriorly:Superficial temporal A

Posteriorly: Posterior auricular A

Answer 4

Jkj

Question 5

Cartilage next to the perichondrium gets blood supply fomr

Cartilaginous loos, necrosis, chondroneogenesis

Answer 5

J

Question 6

Auricular temporal N

Lesser occipitral N

Great auricular N

Vagus N

Facial N

Answer 6

J

Question 7

Posterior to floor is vagus

Stimulation of vagus N in auditory canal causes cough reflex

Answer 7

J

Question 8

Intraparotid nodes, gastric nodes,

Answer 8

J

Question 9

Outer 2/3 bone, 1/3 cartilage

Skin and periosteum is outer covering

Answer 9

J

Question 10

Sensory to external TM is CN 5, 7, 10

Medial TM is CN 9

Squamous mucosa

Two layers of ____ give the TM its rigidity. Middle is respiratory mucosa

Answer 10

G

Question 11

Ring on outside is annulus

Pars tense: contains fibrous structures

Pars flaccida: just contianns the external squamous portion and internal mucosa -> most affected to pressure change because no rigid CT

Answer 11

J

Question 12

Incus and malleus is in the epitympani

Answer 12

K

Question 13

Adults have a deeper angle of descent of the eustacuan tube

Kids have shallowe tube therefore get more infections

Answer 13

R

Question 14

Mesotympanum: 2nd brachial arch

Epitympanum: head, neck come from 1st brachial arch
U

Answer 14

H

Question 15

Chorda tympani

Taste to anterior 2/3 of tongue

Answer 15

M

Question 16

Facial N bends and gives off greater petrosal N

Exits out sylomastoid foramen into parotid gland

Answer 16

H

Question 17

Four nerve of internal auditory canal: posterior two

Answer 17

Superior vestibular N: utricle, superior canal, horizontal canal

Inferior vestibular nerve: saccule, posterior semicircular canal

Question 18

Cochlear N goes to cochlear and innervates cochlear

Answer 18

J

Question 19

Fluid stays the same

Turn head, horizontal canals make horizontal morning

Tilt headed, superior canal is in sync with inferior canal

Utricle gives horizontal motion

Answer 19

J

Question 20

Scala vestibuli: fluid movement is influences by stapes

Scala tympani

Scala media

Answer 20

J

Question 21

Scala media

Answer 21

Cochlear has tone topic orientation: different parts of the cochlear reacts to different levels of sound

Base high tones
Top high tones